LIS2L02AS STMicroelectronics, LIS2L02AS Datasheet - Page 4

• Manufacturer Part Number: LIS2L02AS
• Manufacturer: STMicroelectronics

Specifications of LIS2L02AS

• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Height (mm): 2.35mm
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / RoHS Status: Specific Sites Compliant

LIS2L02AS
Figure 1. Equivalent electrical circuit
1.2 IC Interface
The complete signal processing uses a fully differential structure, while the final stage converts the differential
signal into a single-ended one to be compatible with the external world.
The first stage is a low-noise capacitive amplifier that implements a Correlated Double Sampling (CDS) at its
output to cancel the offset and the 1/f noise. The produced signal is then sent to two different S&Hs, one for
each channel, and made available to the outside.
The low noise input amplifier operates at 200 kHz while the two S&Hs operate at a sampling frequency of 66
kHz. This allows a large oversampling ratio, which leads to in-band noise reduction and to an accurate output
waveform.
All the analog parameters (output offset voltage and sensitivity) are ratiometric to the voltage supply. Increasing
or decreasing the voltage supply, the sensitivity and the offset will increase or decrease linearly. The feature
provides the cancellation of the error related to the voltage supply along an analog to digital conversion chain.
1.3 Factory calibration
The IC interface is factory calibrated to provide to the final user a device ready to operate. The parameters which
are trimmed are: gain, offset, common mode and internal clock frequency.
The trimming values are stored inside the device by a poly-fuse structure. Any time the device is turned on, the
memorized bits are downloaded into the registers to be employed during the normal operation. The poly-fuse
approach allows the final user to utilize the device without any need for further calibration
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C
C
C
C
C
C
pr
ps1
ps2
pr
ps1
ps2
C
C
C
C
s1x
s2x
s1y
s2y
R
R
R
R
R
R
s1
r
s2
s1
r
s2
S2x
S1x
S2y
S1y
rot